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v3.21.2

Liquidity (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 02, 2021 | Apr. 16, 2021 | Jul. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  | $ 124,920,000 |  |  | $ 124,920,000 |  | $ 117,904,000
Net loss |  |  |  | 4,613,000 |  | $ 4,425,000 | 7,016,000 | $ 8,568,000 |
Net cash used in operating activities |  |  |  |  |  |  | 15,167,000 | 10,212,000 |
Increase in prepaid expenses and other current assets |  |  |  |  |  |  | 1,932,000 | 1,383,000 |
Decrease in deferred revenue |  |  |  |  |  |  | 5,600,000 |  |
Decrease in accounts payable and accrued expenses |  |  |  |  |  |  | 2,500,000 |  |
Amortization of contract asset |  |  |  | 300,000 |  | $ 0 | 1,100,000 | $ 0 |
Non-cash charges |  |  |  |  |  |  | $ 700,000 |  |
Number of shares of stock (in shares) |  |  |  |  |  |  | 157,130 |  |
Milestone payment received |  |  |  | 1,000,000.0 | $ 1,000,000.0 |  | $ 2,000,000.0 |  |
Potential milestone payments to be received |  |  |  |  |  |  | 192,500,000 |  |
Cash and cash equivalents |  |  |  | 29,917,000 |  |  | 29,917,000 |  | 35,302,000
Restricted cash and cash equivalents |  |  |  | 100,000 |  |  | 100,000 |  | 100,000
Stock subscription receivable |  |  |  | $ 2,240,000 |  |  | $ 2,240,000 |  | $ 0
Subsequent Event |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds of common stock | $ 2,200,000 |  |  |  |  |  |  |  |
Sales Agreement |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Sale of shares, common stock gross proceeds |  | $ 50,000,000.0 |  |  |  |  |  |  |
Percentage gross proceeds from the sale of share (as a percent) |  | 3.00% |  |  |  |  |  |  |
Number of shares of stock (in shares) |  |  |  | 786,927 |  |  |  |  |
Stock price per share (in dollars per share) |  |  |  | $ 12.04 |  |  | $ 12.04 |  |
Net proceeds of common stock |  |  |  | $ 9,000,000.0 |  |  |  |  |
Sales Agreement | Subsequent Event |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Net proceeds of common stock |  |  | $ 2,200,000 |  |  |  |  |  |

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